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(No Model.)

D. M00. SMYTH.

BOOK SEWING MACHINE. N0. 338,001. Patented Mar. 16, 1886.

Wisdom JWMOZ j jj' UNTTE STATES PATENT EEEJE.

DAVID MGC. SMYTH, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE SMYTH MANUFACTURING COMPANY, OF SAME PLACE.

BOOK-SEWING MACHINE.

SPECIFICATION forming par of Letters Patent No. 338,001, dated March 16, 1886.

Application filed June 20, 1885. Serial X0. 169,255.

To aZZ whom it may concern.-

Be it known that I, DAVID MQC. SMYTH, of Hartford, in the county of Hartford and State of Connecticut, have invented an Improvement in BookSewing Machines, of which the following is a specification.

The object of the present invention is to produce uniformity in the sewing in each signature and to unite the threads in one signature with those in the next with a strong but elastic looping. I make use of semicircular needles, workingin pairs. Ifthe book is small, one pair will be sufficient. The larger books are sewed with two, three, four or-more pairs of these needles. As each pair operates in the same manner, I have only shown one pair, and will proceed to describe the mode of operation of the same.

In the drawings, Figure l is an elevation of the needles and asignature being sewed. Fig. 2 is a representation of part of a book-back, showing also the manner in which the threads are laid together,

The signatures are usually sawed at the places where the needles pass in and leave the folded signatures. The needles 1 Z are each in the form of a half-circle, and upon the arm that projects from the shaft k, and to the needles the proper oscillating movements are given. By reference to my Patent No. 220,312 afull description of these needles and the manner of operating them will be found. In my present improvements, however, the needles are placed in pairs, and partial rotations are given in opposite directions, so that the nee dles penetrate the fold of the signature at the points 2 3 simultaneously and emerge at at .3 simultaneously; hence such needles are oscillated or swung in opposite directions simultaneously, and they enter each signature and sew it in the same manner, so that all the signatures are uniformly sewed.

I make use of suitable looping devices, aone at the point of emergence of each needle. A looper and devices for operating the same are shown in my former Patent No. 250,991, and such a looper is available with the present improvement. The needles are passed in at the notches 2 3, and their points project through (No specimens.)

the notches 5. The loopers move forward and take a loop of the thread from each needle. The needles draw back, leaving double threads through the folds of the signatures. Another signature is added. The needles enter its notches, and as the points emerge they pass into the loops held by the loopers a". The loopers retire and drop the loops over the points of the needles and then move forward again and take fresh loops of thread from the needles and hold them, and so on the sewing pro grosses, there being a chain of loops in the notches 4 5, and the threads passing at 2 and 3 out of one signature into the next.

At the notches 2 and 3 it is preferable to interlace cross threads, (there may be one at each notch,) the same being laid in by a vibrating eye, a, as shown in my Patent No. 274,986; but I prefer to make use of one thread, m, interlaced with the threads from the two needles. This is effected by the vibrating eye carrying the thread to the right of the place where the needle Z enters at one stitch and then to the left of the place where the needle Z enters at the next stitch, so that the thread at will be interlaced across and across between the notches 2 and 3, and will bind the threads together as they pass out of such notches, in the manner shown in Fig. 2.

After the sewing has been performed, or during the progress of that sewing, a tape or strip of parchment, or, (shown by dotted lines in Fig. 2,) may be laid beneath the threads at, and thereby aid in strengthening the binding.

I do not herein claim the book represented in the drawings as sewed by this machine, the

same forming the subject of my application ing thread-carrier to interlace a thread with in one signature to the loops of threads in the 10 the other threads where the needles enter and adjacent signatures, substantially as set forth. leave the signatures, substantially as set forth. Signed by me this 13th day of June, A. D.

3. In a book-sewing machine, two curved 1885.

needles carrying threads and swinging simu1 5 taneously in opposite directions for passing DAVID S H' loops of threads into the signatures in oppo- Witnesses: V I V v. site directions, and means, substantially as W. B. MOORAY, specified, for connecting the loops of threads CHAS. E. PARKER. 

